The itching of the skin in the process of plastering is a normal reaction of the skin, not a reaction to the elimination of dampness. In the process of applying ointment, because the drug contains more pungent and warm drugs, which are irritating to the skin, mild itchy skin will be felt, which is a normal reaction, some ointment contains more pungent and warm irritating drugs, which will lead to skin allergic reaction, so patients with skin allergic reaction may feel itchy skin; there will also be local red papules, which will appear local redness, swelling, heat and pain, for which the cream should be carefully selected and may trigger a generalized allergic reaction. If there is localized redness, swelling, heat pain or tingling sensation and accompanied by red papules, the cream must be removed in time to avoid causing a systemic allergic reaction.