According to the CDC, ringworm, also known as "tinea" or "dermatophytosis," causes a red, itchy rash. Ringworm is contagious fungal diseases on skin, surfaces, towels, garments, and mattresses.
Still blushing? The NIH estimates 14 million Americans, aged 30–60, have rosacea. Rosacea usually affects women. Joyce Davis, MD, a New York City board-certified dermatologist, thinks it affects pale skin.
A February 2016 Immunology and Allergy Clinics of North America study found 10–20% of developed-country children have eczema. Westchester dermatologist Lisa Anthony, MD, feels it may improve with age.
The NEA defines contact dermatitis as inflamed skin after trigger contact. Davis calls contact dermatitis allergic. “Something you touched irritates your skin, or a non-hereditary allergic dermatitis like poison ivy.”
Bacterial impetigo creates big blisters or crusty ulcers, according to the Mayo Clinic. The CDC says kids get impetigo from group A streptococcus or Staphylococcus aureus. Contagiously itchy.
The Mayo Clinic defines cradle cap as newborn scalp dandruff. Davis says scalp eczema, which causes dry, scaly areas on the scalp, mainly affects people with thick, oily skin.
Cedars-Sinai describes pityriasis rosea as a herald patch and oval tumors on the back, chest, and belly. "Christmas tree rash" refers to pityriasis rosea's red, scaly back.
Sun exposure causes precancerous actinic keratosis, according to the AAD. Weinberg says dermatologists see actinic keratosis regularly. Face and lip actinic keratosis lesions are flat, scaly, and sometimes rough.
Johns Hopkins Medicine lists jock itch, ringworm, and athlete's foot tinea. Wet crotch, inner thighs, and buttocks redden and flake.
The Cleveland Clinic says teens and tropical residents with oily skin are more prone to tinea versicolor. Weinberg calls tinea versicolor a cutaneous yeast infection.