One possible cause for small bumps on the forehead is a condition called perioral dermatitis, according to AARP. Perioral Dermatitis is a rash that typically affects the skin around the mouth, but bumps may also sometimes occur on the forehead and chin. Another possibility is rosacea, says WebMD.
Rosacea is a skin disease that results in redness and tenderness around the skin on the forehead, cheeks, chin and nose. The reddened areas are often accompanied by small bumps, explains WebMD. The condition is caused by some type of skin irritation, but it is not believed to be a bacterial infection. Rosacea usually occurs in people over the age of 30 and tends to be hereditary. It is also more common in people who have fair skin.
People with rosacea experience flare-ups that may be triggered by a variety of things, including sun exposure, exercise, hot weather or spicy food. The triggers cause the blood vessels under the skin to expand, resulting in the red coloring, states WebMD.
Perioral Dermatitis, on the other hand, resembles the look the of acne and may be caused by a bacterial infection, reports AARP. Other possible causes for perioral dermatitis include topical steroid use, oral contraceptives, sunscreen application and fluoridated toothpaste.