After being bitten by the cryptococcus, which leaves a red mark, you should immediately rinse it off, and then apply topical and systemic medication to alleviate the symptoms and eliminate the red mark. 1. Immediate rinsing: After being bitten by the cryptococcus, wash immediately with soapy water and sodium bicarbonate solution because the cryptococcus releases toxic substances, which may leave red marks if they remain in the skin. 2. Topical medication: After being bitten by the cryptozooplasmosis caused dermatitis, leaving red marks, it is recommended to apply topical zinc oxide oil, Dinaid cream, etc., after the inflammation is reduced, the red marks will gradually subside. For patients with allergic reactions, glycerin lotion can be applied to relieve itching, and the red marks will gradually fade. 3. Systemic medication: If after being stung by the cryptococcus, the lesions are large in scope and pustules may appear in the later stage. Oral glucocorticoid drugs, such as prednisone acetate, can be taken as prescribed by the doctor. After being bitten by cryptozooplasmosis, it should be observed regularly. If the red mark exists for a long time or has left a scar, which affects the beauty, you can choose to go to the hospital to do laser treatment, etc., which should be carried out under the guidance of professional physicians.