Dense small pimples on the face may be related to bad habits leading to acne, contact dermatitis, etc. If it is caused by bad habits, the patient needs to regulate habits; if it is caused by contact dermatitis, the patient needs to get rid of allergens and oral antihistamine drugs for treatment. 1. Bad habits lead to acne: If the patient has long-term consumption of greasy, spicy food, stay up late and other bad habits, may cause the skin to secrete more oil, easy to lead to pore clogging, resulting in a dense small pimples on the face, which is also known as acne vulgaris. For this situation, patients need to regulate lifestyle habits, such as regular work and rest time, do not stay up late, try to avoid spicy and stimulating food, usually can eat more fresh vegetables and fruits. 2. Contact dermatitis: contact dermatitis is mainly manifested as pinpoint-sized, densely distributed pimples, papules, these rashes are usually similar to small pimples, so contact dermatitis patients can also appear on the face of the dense small pox situation. Contact dermatitis caused by allergy, the patient should be quickly detached from the allergen, so as not to aggravate the symptoms, in addition, the patient also needs to take oral antihistamines for treatment, such as chlorpheniramine, cetirizine and so on. There are other reasons for the dense small pox on the face, it is recommended that patients go to the hospital in time to find out the cause of the disease, standardized treatment, so as not to delay the condition.