Idiopathic guttate hypomelanosis - Skin
IGH has been hypothesized to be UV induced, although another hypothesis suggests that it may reflect the normal aging process.
IGH occurs in all skin types but is more common in whites who have had significant sun exposure. An apparent female predominance may be attributable to increased female perception of skin changes as a cosmetic problem. Lesions typically occur in middle age and increase in incidence with age. No spontaneous repigmentation has been observed.
L81.9 – Disorder of pigmentation, unspecified
1717003 – Idiopathic guttate hypomelanosis
- Hypopigmented flat warts – These are perceptibly raised.
- Vitiligo – Lesions are symmetrical, usually acral, and milky white and coalesce to form larger depigmented patches.
- Tinea versicolor – Usually truncal and slightly scaly.
- Pityriasis alba – Usually seen in atopic children; lesions are ill defined.
- Pityriasis lichenoides chronica (PLC) – Usually seen in a younger patient population than IGH and found on sun-protected skin; in young, darker-skinned patients, PLC may present as hypopigmented macules, and PLC may resolve with guttate leukoderma.
- Leukoderma punctata – 0.5- to 1.5-mm achromic macules that follow PUVA or UVB therapy.
- Lichen sclerosus – Shows a "tissue paper" atrophic appearance with telangiectasia; not confined to sun-exposed skin.
- Atrophie blanche – Favors the distal shins and ankles but are usually atrophic and surrounded by telangiectasia.