The causes of many small bumps on the tattoo include contact dermatitis, syphilis rash, herpes simplex, warts, etc. The treatment includes medication, physical therapy and other methods. 1. Contact dermatitis: If you are in contact with some irritating substances after the small bumps, then you can give halometasone cream anti-allergy treatment. At the same time to clarify the causative factors and avoid re-exposure. 2. syphilis rash: if the syphilis spirochete infection caused the bumps, then you can give benzylpenicillin and other drugs anti-syphilis spirochete treatment. 3. Herpes simplex: If the bumps are caused by herpes simplex virus infection, you can give acyclovir and other drugs for anti-viral treatment. 4. warts: because the human papilloma virus infection of the human body will trigger the proliferation of the skin, at this time can be used externally imiquimod ointment, fluorouracil ointment and other drugs, or choose physical therapy such as freezing, laser and other methods. Finally, the appearance of tattoos on the body a lot of small bumps of the phenomenon please consult a doctor, all drugs please follow the doctor’s instructions to use.