The difference between allergic pimples and acne is in the following aspects: First, the causative factors, allergic pimples are mostly due to sunlight UV allergy, cosmetic allergy, or contact with tree hair, willow, animal fur allergy, or consumption of spicy and irritating food and drinking alcohol, beverage allergy, acne pimples are mainly due to Propionibacterium acnes infection caused by inflammatory diseases. Second, rash performance, allergic acne can appear in addition to acne, papules, maculopapular rash, blisters, vesicles and other polymorphic rashes, the rash is symmetrically distributed, and the boundaries are not clear. Acne pimples mainly appear as folliculitis papules and pustules, which do not fuse with each other. Third, the self-conscious performance, allergic acne can appear itching performance, acne pimples can appear painful performance.