Blackheads are a type of acne caused when normal skin pigment builds up in the oil gland ducts, according to the American Osteopathic College of Dermatology. Blackheads can show up anywhere on your body except the bottoms of your feet and palms. Clear up blackheads on your thighs by cleaning them as you would your face and applying topical treatments designed to fight blackheads. It may take a couple of months for you to see results, so don't give up. Severe acne may require more extreme treatments such as prescription topical and oral medications that you can discuss with a dermatologist.

Shower twice a day and wash your thighs with a mild cleanser designed for the face, as recommended by Acne.org's "Body Acne Regimen." Avoid harsh scrubbers and instead use your hands to wash your thighs.

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Allow your thighs to dry. Use a towel to lightly pat your thighs and rid them of any moisture, advises Acne.org.

Spread a layer of a topical acne medication that includes resorcinol, sulfur and/or salicylic acid onto your thighs, advises the National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS) 1. NIAMS is a part of the Department of Health and Human Services' National Institutes of Health. These ingredients have been shown to break down blackheads. Apply the product everywhere on your thighs that you have seen blackheads, as topical medications will help prevent more blackheads from forming. Use once a day, or more if so directed by your dermatologist.

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Put on adequate sunscreen when wearing swimwear to protect your thighs from sun damage. Acne medications may increase the risk of sunburn, according to NIAMS 1.

Wear clothing that is loose in the thighs. Tight clothing can rub and therefore irritate your skin, which can cause more acne, according to CareFair.com.

Visit your dermatologist if you are not seeing a reduction in blackheads within eight weeks, as it may take up to eight weeks for results, according to NIAMS. Take any medications he or she prescribes, and only use what your doctor tells you to. Topical medications that are prescription-strength may be more effective against your blackhead breakouts.

Ask about acne surgery. Dermatologists can use a tool called a loop extractor to loosen and remove blackheads. Microdermabrasion may also be used to unclog pores, according to American Osteopathic College of Dermatology.

Warnings

Both over-the-counter and prescription-strength topical medications may cause side effects. Your skin may become red, dry or irritated. Speak with your doctor if the side effects are extreme, recommends the NIAMS.