According to WebMD, a mild rash that surrounds a tattoo can be treated at home. First, stop any bleeding or oozing by applying pressure to the area. Then, apply a cold pack and take an antihistamine, such as Benadryl or Chlor-Trimeton. Follow all medication instructions, and seek medical attention if the rash does not improve or it gets worse.
WebMD notes that new tattoos should not come into contact with strong soaps or detergents. This may cause an allergic reaction or irritation that could inflame the area. To protect a new tattoo, apply antibiotic ointment to the area and cover it with a non-stick bandage. Avoid applying an adhesive bandage directly to the tattoo. If a bandage sticks to the skin, do not pull it off, as this may reopen healing sores.
Instead, let the bandage soak in warm water until it can be removed without ripping the skin. Change the bandage if it gets wet, and apply a clean bandage every day. Some people may experience an allergic reaction to antibiotic ointment. If applying an antibiotic ointment exacerbates the rash, wash off the ointment and do not reapply. WebMD recommends seeking medical attention if the rash does not improve.