Cryptosporidium is usually a kind of insects, if bitten by it, usually there will be localized redness, swelling, pain, itching and other manifestations, mainly allergic, inflammatory symptoms, usually the principle of treatment is based on anti-allergic, anti-inflammatory, you can apply dexamethasone ointment, benadryl ointment, salbutamol ointment and so on, which have anti-inflammatory and anti-allergic effects. If the symptoms are not relieved after using the ointment, or some systemic symptoms appear, such as maculopapular urticaria all over the body, or a rash like an eruption, and itching, it is possible that there is a systemic allergic manifestation, which must be dealt with in the hospital, with intravenous or intramuscular injections of anti-inflammatory and anti-allergic drugs, such as benadryl and dexamethasone.