5 Psoriasis Mistakes You're Probably Making

中文摘要在文末

Usual caveat: not a lecture. Psoriasis patients are, in my experience, some of the most diligent people I treat — largely because the condition gives them no choice. These are traps, not accusations.

1. Stopping treatment when it looks clear

The most common one, and the most understandable.

Your skin clears. The plaques have gone. The obvious conclusion is that the treatment worked and is therefore finished.

But psoriasis isn't an infection you complete a course for. The immune process driving it is still running — you've suppressed the visible result, not switched off the cause. Stop entirely and it returns, often within weeks.

That's why the plan has a step-down rather than a stop. Potent topical treatment to get control, typically around two weeks. Then down to a combination of a steroid and a vitamin D analogue. Then down again to the vitamin D analogue alone. And coal tar running throughout as basic maintenance, started early rather than held back as a last resort.

The maintenance phase isn't optional extra time. It's the phase that determines what your skin does for the next two years.

Related: don't stop the emollient either. For psoriasis I use urea-based cream as the main emollient — different from the ceramide-based products I use for eczema, because it's a different problem. That continues regardless of what else is happening.

2. Picking off the scale

I understand the impulse completely. Thick scale that's lifting at the edges is almost designed to be picked at, and there's a real satisfaction in removing it.

Please don't.

Psoriasis responds badly to skin trauma. Damaging skin can trigger new psoriasis at the site of the injury — which means picking a plaque can worsen it or extend it, and scratching can produce fresh psoriasis where there wasn't any.

This is also why I mention the pinpoint-bleeding sign in the diagnosis article and then immediately tell people not to test it at home. It's a real feature. It isn't a home experiment.

If thick scale is the problem, tell me. There are treatments for exactly this — salicylic acid preparations to break the scale down so that other treatments can actually reach the skin underneath. That's a far better route than your fingernails, and it makes everything else work better.

3. Buying steroid cream over the counter and using it indefinitely

Two separate problems here.

Potency versus site. Steroid creams come in strength classes, and what's appropriate depends heavily on where it's going. Skin thickness varies enormously — eyelids are very thin, palms and soles very thick. A tube that becomes the household cream for every itchy patch will be wrong for most of the places it's used.

And the psoriasis-specific problem: unsupervised, indefinite use with no step-down. Psoriasis treatment is supposed to be a structured sequence — control, then step down, then maintain. Buying a strong steroid and applying it to the same plaques for months has none of that structure, and the long-term consequences of potent steroids used continuously on the same site are real.

If you've been doing this, don't feel bad, and bring the tube in. Knowing exactly what's been applied and for how long genuinely changes what I'd recommend next.

4. Not mentioning joint symptoms

This is the one that costs the most, and it's the reason I wrote a separate article about it.

Psoriatic arthritis is part of this disease, and joint damage does not reverse.

Everything else in psoriasis is retryable. Skin flares can be brought back under control; a treatment that fails can be swapped. Joints are the exception — damage accumulates and stays.

And patients routinely don't mention joint symptoms at a skin appointment, for entirely reasonable-sounding reasons: that's not why I came, it's probably just age, I've been working hard, joints aren't the skin doctor's department.

Mention it anyway. Especially if you're sure it's unrelated.

What matters: morning stiffness that loosens as the day goes on, pain or swelling in fingers, toes or back, and changes in how you use your hands. I'll ask more carefully if your nails are involved, since nail changes are associated with psoriatic arthritis.

And to be clear about what I'll do with it: I'm a skin doctor, not a joint doctor. My ability to diagnose psoriatic arthritis well is limited, so I keep a low threshold for referring to rheumatology. If there's a real question, I send you to someone who assesses joints all day rather than guessing about something permanent.

5. Chasing dietary cures

Psoriasis attracts dietary claims the way few conditions do. There's always an elimination diet, a supplement, or a protocol that someone found online.

Here's my position.

Nothing in diet cures psoriasis. If something did, it would be standard treatment everywhere, because psoriasis is common and well studied and there's no shortage of people who'd like an answer that isn't a prescription.

There are things that plausibly help control — alcohol, smoking and weight come up consistently in the research as factors that, better managed, may improve how well psoriasis is controlled. Those are worth knowing about, and if you ask me what else you can do beyond medication, I'll give you that list and go into detail on whatever you want.

But there's an important limit. The evidence that these things travel with psoriasis is much stronger than the evidence that fixing them fixes your skin. I'll help you with any of them, and I won't promise you an outcome I can't support.

And I won't push them on you if you're already carrying a lot. I run a weight management programme at this clinic and I generally don't raise it with psoriasis patients unless they raise it first — because psoriasis is already taxing, and stacking a demanding long-term programme onto someone who's stressed risks a breakdown rather than an improvement. Ask me and we'll talk properly. Don't ask, and I'll assume you've got enough on.

What I'd steer you away from is months of restrictive dieting while the skin goes untreated. Treat the psoriasis. Then, with a clearer head, look at the rest.

And two things that aren't mistakes

Having psoriasis that's harder to control than it used to be.

Your maintenance baseline can shift over the years. Well-controlled at 50 may mean mild scaling where well-controlled at 30 meant clear skin. That's the disease's trajectory, not your failure and not the treatment failing.

What matters is the distinction between a baseline that has settled slightly worse and is stable — that's the new normal — and a baseline that keeps climbing, which is a signal that we should discuss whether topical treatment is still the right tier. Telling those apart is a large part of what your reviews are for.

Getting stressed about it.

Stress is one of the commonest triggers I see for psoriasis flares — along with common infections like upper respiratory tract infections. And psoriasis causes stress. That's a genuinely unfair loop and I'm not going to pretend you can simply opt out of it.

But some of that stress is avoidable, and it comes from measuring yourself against a target that no longer applies, or from feeling responsible for a disease you didn't cause. Neither of those is warranted.

The mental burden of psoriasis is, in my view, its most underestimated consequence — lifelong, visible, and flaring precisely when you have the least capacity to cope. If it's affecting your mood, sleep or daily life, tell me. That's clinical information, not a complaint.

What to bring

Everything you've used. Any records of what you've been on. Photographs if you have them. Family, if they'll come — I'll explain directly to them that psoriasis isn't contagious, because convincing the people around you is often harder than convincing you, and you shouldn't have to do that alone.

And joint symptoms. Even the ones you're certain are unrelated.

Klinik Dr Tan (Skin & Acne), Lot 27, Ground Floor, Block D, Lintas Square, Kota Kinabalu. WhatsApp 017-234 7328. Appointments preferred.

I'm a GP with a strong interest in skin, not a dermatologist. For phototherapy, higher-tier systemic treatment or joint assessment, I refer.

Book a consultation with Dr. Tan — Book Online or WhatsApp 017-234 7328.

Read more about Psoriasis : Psoriasis Treatment, Psoriasis Is Not Just a Skin Disease, Is It Psoriasis, Eczema, or Fungal, The Moving Baseline, Scalp and Nail Psoriasis

简要说明

我是陈医生，亚庇 Lintas Square 的 Klinik Dr Tan（皮肤与暗疮）。这是陷阱清单，不是指责——依我的经验，干癣病人是我治疗的病人中最自律的一群，很大程度上是因为这个病不给他们选择。

1. 看起来干净了就停药

最常见，也最能理解。皮肤清了、斑块不见了，直觉的结论是「药有效，所以疗程结束了」。

但干癣不是吃完一个疗程就结束的感染。驱动它的免疫过程还在运作——你压下的是看得见的结果，不是原因。完全停掉，它常在几周内回来。

所以计划里是降阶，不是停止：强效外用取得控制（约两周）→ 类固醇＋维生素D衍生物的复方 → 单用维生素D衍生物。而煤焦油从早期开始、全程维持作为基本的维持治疗，而不是留到最后才用。

维持期不是多出来的时间，它决定你的皮肤未来两年会怎样。

相关：保湿也别停。干癣我用尿素（urea）为主的保湿，和湿疹用的神经酰胺类不同，因为是不同的问题。

2. 把鳞屑抠掉

我完全理解那个冲动。但请不要。

干癣对皮肤创伤反应很差——受伤的皮肤可能长出新的干癣。所以抠斑块可能让它恶化或扩大，抓伤也可能在原本没有的地方长出新的干癣。

这也是为什么我在诊断那篇提到「剥掉鳞屑会点状出血」，然后马上叫大家不要在家试。那是真实的诊断特征，不是居家实验。

鳞屑太厚请告诉我——有水杨酸制剂可以软化鳞屑，好让其他药物能到达底下的皮肤。那比用指甲好太多，而且会让其他治疗都更有效。

3. 在药房买类固醇然后无限期使用

两个问题。强度对部位：眼皮很薄、手掌脚底很厚，一支「家庭万用药膏」在多数使用的部位都是错的。以及干癣特有的问题：没有监督、没有降阶、无限期使用。 干癣治疗本来应该是有结构的序列——控制、降阶、维持。

如果你一直这样做，不必自责，请把药膏带来。知道确切用了什么、用了多久，会真的改变我接下来的建议。

4. 不提关节症状

这是代价最高的一个，也是我为它另写一篇的原因。

乾癣性关节炎是这个疾病的一部分，而关节损伤不可逆。 干癣的其他部分都可以重来——皮肤发作可以再控制回来，药无效可以换。关节是例外：损伤会累积并留下。

病人常常不在皮肤门诊提关节症状，理由都听起来很合理：「我不是为这个来的」「大概是年纪」「最近做工多」「关节不是皮肤科的范围」。

还是请说。尤其是你确定无关的时候。

重点：晨间僵硬（活动后缓解）、手指脚趾背部的疼痛或肿胀、使用双手方式的改变。指甲有变化的话我会问得更仔细，因为指甲侵犯与乾癣性关节炎有关联。

我会怎么处理：我是皮肤科医生，不是关节医生。 我诊断乾癣性关节炎的能力有限，所以我转介风湿科的门槛很低——与其对一件永久性的事情猜测，不如把你送去每天在看关节的人那里。

5. 追求靠饮食治愈

没有任何饮食能根治干癣。 如果有，它早就是全世界的标准治疗了。

有些东西可能有助于控制——酒精、吸烟、体重在研究中一再出现。如果你问我除了药物还能做什么，我会给你这份清单，并就你想深入的部分详谈。

但有个重要的界线：「这些因素与干癣同行」的证据，远强于「改善它们就能改善你的皮肤」的证据。我会协助你处理任何一项，但我不会承诺我无法支持的结果。

而且如果你已经承受很多，我不会主动推。 我的诊所有体重管理计划，但除非你先提，我通常不会对干癣病人提起——因为干癣本身已经很消耗，叠加一个要求很高的长期计划，风险是崩溃而不是改善。你问，我们好好谈；你不问，我就当你已经够忙了。

我会劝你避免的，是在皮肤没有被治疗的情况下进行数月的严格戒口。先治干癣，之后再用清楚的头脑看其他的。

两件不算错误的事

干癣变得比以前难控制：维持线会随年月移动。五十岁的「控制良好」可能是轻微脱屑，而三十岁的「控制良好」是干净的皮肤。那是疾病的轨迹，不是你的失败，也不是治疗失败。

重点是分辨：基线安定在稍差的位置但稳定（那是新常态）vs 基线持续攀升（那是讯号，我们该讨论外用是否还是正确的层级）。分辨这两者，正是复诊的主要用途之一。

为它感到压力：压力是我看到最常见的干癣发作诱因之一（还有上呼吸道感染之类的常见感染），而干癣又造成压力。那是一个真正不公平的循环，我不会假装你可以说不玩就不玩。

但有一部分压力是可以避免的——它来自「拿一个不再适用的标准衡量自己」，或来自「为一个不是你造成的疾病感到有责任」。这两者都没有道理。

依我看，干癣最被低估的后果就是它的心理负担——终身的、看得见的，而且正好在你最没有余裕的时候发作。如果它影响到你的情绪、睡眠或生活，请告诉我。那是临床资讯，不是抱怨。

请带来：用过的所有东西、用药记录、照片。家人如果愿意来更好——我会直接向他们说明干癣不会传染，因为说服身边的人往往比说服你更难，而你不该独自承担这件事。

以及关节症状。即使是那些你确定无关的。

Klinik Dr Tan (Skin & Acne)，Lot 27, Ground Floor, Block D, Lintas Square, Kota Kinabalu。WhatsApp：017-234 7328。建议预约。

Book a consultation with Dr. Tan — Book Online or WhatsApp 017-234 7328.