The skin plays a role in defending against bacteria and regulating body temperature. If there is a problem inside the body, the skin will also send out warning signals. 1, yellow palms and feet may be due to hypothyroidism and elevated levels of beta carotene in the blood. Symptoms include yellow, dry skin, weak limbs, slow movement, pale and waxy face, and weight gain. women over 50 years old are most susceptible. 2, sunlight appears measles It is likely that you have eaten photosensitive drugs. Thiazide diuretics, tetracyclines, antihistamines, and tricyclic antidepressants that lower blood pressure can make people sensitive to light. When you go out after taking such medications, it is best to wear sunglasses and a sun hat. 3, red papule or maculopapular rash Later will gradually expand or fuse into pieces, becoming bright red or deep red, higher than the skin, clear edges, surrounded by an inflammatory red halo, the surface covered with multiple layers of grayish white or silvery white scales, gently scrape away the surface scales, gradually revealing a layer of light red shiny translucent film, known as the film phenomenon, which is the keratin layer was peeled off to reveal the thorny cell layer, if the film is scraped away again, will be the dermis If the film is then scraped, the top capillaries of the papillary layer will be scraped and many small bleeding spots will appear, and these can basically be identified as symptoms of psoriasis (commonly known as psoriasis). 4, large blue lumps on the legs may be varicose veins. In severe cases, the lower limbs are distended and weak, and it is difficult to walk. 50% of people over 50 years of age have mild varicose veins. Wearing loose socks and avoiding cross-legged sitting can relieve the symptoms, but in severe cases, medical attention must be sought. 5.Brown spots appear on the shin area When diabetic patients are traumatized, capillaries and some small blood vessels are very easy to rupture and form brown spots. If a normal person has brown spots, check to see if there are symptoms of diabetes.