In the past, it was only on the legs, but now there are unknown causes on the limbs and body. It has been repeated for a year. It is not painful or itchy under normal conditions (occasionally itching). Relevant information: 1 First "rash" 2 After a period of time, there will be a little white "pus" in the middle of the "rash", but it can't squeeze out (not every rash has this situation, but there will be) 3 When you pick the "rash", it will form a layer of skin. If you pull the skin off, the rash will turn blood red 4 Rubbed erythromycin ointment / Desonide ointment / hormone ointment / none used 5 Self regression time: it will subside in a short few weeks and will not subside in a long one or two months (but allowing it to subside will leave scars and recur after a period of time) 6 I've seen the doctor do a blood test (but I don't know what items to check) and the reason is still unknown. The ointment he prescribed is useless
Most of these symptoms are caused by skin sensitive stimulation. For example, dryness caused by environmental factors may cause this symptom. It is recommended to pay more attention to observe whether there are adverse reactions. If there are patches or viral symptoms, pay more attention to the fever.
This situation is considered to be the possibility of purpura. If the blood test is OK, it is to consider Henoch Schonlein purpura. Generally speaking, it is related to infection, and immune system dysfunction. You can take loratadine and compound glycyrrhizin capsules. It can be treated with Halometasone Cream. Try to eat less spicy food. Eat more fruits and vegetables and drink more water.
From your photos, consider allergy or folliculitis. Don't take too frequent hot baths on your skin. Just pay attention to moisturizing. Also pay attention to close fitting clothes. Those who wear cotton thread, not wool and chemical fiber. Stay away from pets. You can use drugs according to your doctor or chloroiodohydroquine ointment