ringworm
癬 centers on a specific skin condition: ringworm, a fungal infection causing ring-shaped patches.
癬 combines 疒 (sickness) with 鮮, which likely contributes the sound セン. The character is used for ringworm, a skin disease.
The sickness enclosure 疒 surrounds 鮮, which suggests fresh or vivid. Picture a vivid, ring-shaped rash that stands out on the skin: ringworm.
For セン, imagine a centipede crawling in a ring on the skin, causing the ringworm rash: cent -> セン.
psoriasis
ringworm; tinea
ringworm (of the scalp); tinea capitis
scabies; the itch; mange
psoriasis vulgaris; plaque psoriasis
lichen planus
lichen planopilaris; lichen pilaris; keratosis pilaris; follicular keratosis; chicken skin
onychomycosis; tinea unguium
itch mite (Sarcoptes scabiei)
Trichophyton fungus (dermatophyte that causes ringworm, etc.)
scabies; the itch; mange
itch mite (Sarcoptes scabiei)
lichen
athlete's foot; foot ringworm; tinea pedis
ringworm; tinea
ringworm (of the groin); jock itch; tinea cruris
ringworm (of the scalp); tinea capitis
ichthyosis
favus
achorion fungus