Causes of rash on face

What is the cause of the rash on your face? This situation is more common in allergies or external stimuli, first of all, we should try to find suspicious pathogenic factors, remove incentives, prevent the disease from worsening again, local can not use superheated water to scald, do not use facial cleanser, soap and other bath products, do not scratch, stimulate rash, temporarily do not eat fish and shrimp, seafood wine and spicy food, local we can use calamine lotion, tacrolimus ointment or weak glucocorticoid cream. For patients with very severe itching, oral loratadine, cetirizine and other anti-allergic drugs can also be combined for treatment.