What are the initial symptoms of psoriasis?

Psoriasis, also known as psoriasis vulgaris, mainly presents the following symptoms in its early stages: 1. **Rash appearance**: Patients develop red papules or macules on the skin surface. These rashes are typically the size of millet grains to green peas and commonly occur on areas such as the scalp, trunk, extensor surfaces of the limbs, and the lumbosacral region. 2. **Scale coverage**: A layer of silver-white scales covers the red patches. These scales are dry and easily shed. After gently scraping off the scales, a淡red, translucent membrane (known as the film phenomenon) can be observed. 3. **Punctate bleeding**: Further scraping of the membrane reveals small pinpoint bleeding spots, referred to as the phenomenon of punctate bleeding. This is one of the typical symptoms of psoriasis. 4. **Itching**: Some patients experience significant itching, although a small number may have no itching or only mild itching. 5. **Systemic symptoms**: In the early stages of psoriasis, some patients may also experience systemic symptoms such as fever, sore throat, dry mouth, and constipation. The appearance of these symptoms suggests that patients should seek timely medical consultation for accurate diagnosis and treatment.