It is very itchy to grow a lot of pimples on the back of the neck, consider the performance of skin allergies, eczema is the most likely, and sweating stimulation and collar friction, etc., may also be related to ultraviolet allergies. The actual fact is that you can take oral anti-allergy medication, commonly known as second-generation H1 receptor antagonists, such as loratadine or cetirizine. You can apply topical glyburide lotion, which has an astringent and antipruritic effect, or you can combine it with hormonal creams, such as Denide cream or hydrocortisone butyrate cream, which has a significant anti-inflammatory and anti-pruritic effect. You should pay attention to avoid sunlight, avoid scratching and stimulation, avoid spicy and stimulating food, do not eat hair products, etc.