Hot compress itches, cold.

First, itching during hot compress is not necessarily cold, it may be due to some skin allergies to drugs, so patients need to observe whether there are pimples or rashes on the skin. Second, itching during hot compress may also be the operation of their own qi and blood, especially when the skin is dry and dehydrated. Hot compress may cause moisture evaporation, and there will be some itchy feeling. Third, when heated, the blood vessels expand, skin sensitivity increases, and you may feel a little itchy.