A rash that does not hurt or itch on the body could be a common allergy, as some allergies do not hurt or itch. There is also a possibility that this kind of rash is purpura, and purpura can also appear without symptoms and self-sensation. Therefore, at this time, if this situation occurs, the first use of anti-allergy medication, you can generally use topical dianabed cream, oral anti-allergy drugs. You can take oral ebastine, epinastine, loratadine, loratadine citrate and so on. It can also be combined with proprietary Chinese medicines, such as anti-wind and itch-relieving granules, Fangfeng Tongsheng granules, Niu Huang Shang Qing capsule, Huanglian Shang Qing tablets and so on.