The appearance of a red rash on the body may be a skin scratching disorder of urticaria or a swelling pattern, which needs to be combined with the state of the lesion. If it is a red pruritic rash, it can be treated with topical topical stove glycolic lotion and oral antihistamines, while avoiding picking and scratching irritation, common antihistamines include cetirizine, loratadine, etc. If the lesions occur in the axillae, groin, thighs, buttocks and other parts of the body, manifesting as red crack-like lesions, consider the formation of swelling lines due to skin elastic fiber rupture, related to excessive weight growth, excessive growth, the use of glucocorticoids and other factors. In the early stage of swelling lines, topical application of retinoic acid cream or cosmetic laser treatment can be given. For the late stage of swelling lines, there is usually no treatment, but there is no impact on health.