The STD that causes white spots on skin is Molluscum contagiosum which causes small, raised, painless bumps that are often pearly white or fleshed colored.
Other STD's that can cause white spots on the skin are syphilis, chlamydia, genital warts caused by HPV and Lichen Sclerosus.
Syphilis in it's secondary stage can cause a rash of white spots on your skin, most particularly on the palms and soles.
Chlamydia can cause white spots or discharge in your genital area.
And genital warts caused by HPV can cause warts which appear as white or flesh colored bumps on your skin or mucous membranes.
And Lichen sclerosus is a non infectious skin condition which can cause white patches on the genitals.
Other causes of white spots on your skin are Fordyce Spots, psoriasis and eczema.
Fordyce spots are benign white bumps on your lips or genitals.
Psoriasis is a chronic, immune mediated skin disease which causes patches of skin to become inflamed, itchy and scaly.
Psoriasis is not contagious and can vary in severity from mild to severe.
Symptoms of psoriasis include red, raised and sometimes painful or itchy patches of skin covered with silvery scales.
Psoriasis can affect any part of your body, but commonly appears on your knees, elbows, scalp and lower back.
Eczema is also called atopic dermatitis and is a group of inflammatory skin conditions, which cause itchy, red and dry rashes and can also lead to thickened, scaly or cracked skin.
Eczema is more common in people that have a family history or asthma or allergies although anyone can get eczema.
Symptoms of eczema include intense itching, red or brownish gray patches, small, raised bumps which may ooze fluid when scratched, crusty patches of dried yellowish ooze, which may indicate infection, thickened, scaly skin, sore or raw feeling skin and rashes that can vary in appearance depending on skint one and in infants, eczema can appear on the scalp, face, arms, legs, back and chest.