Etymology
- Saurat: Lichen striatus is incorrect terminology because it is not a lichen and striated refers to a surface with shallow grooves which is not the case
Epidemiology
- Primarily children 4 months - 15 years
- Female to male ratio 1,6-2:1
- Seasonal variation: spring and summer
Etiology
- Somatic mosaicism
- Gene unknown
- Keratinocytes migrate along the lines of Blaschko
- Association with atopy → is an atopic diathesis
- Triggering event makes the mosaic to reveal itself
- Virus? May explain seasonal variation
- BCG vaccine?
- → induces aberrant clone of keratinocytes to produce a novel surface antigen
Clinical presentation
- Continuous or interrupted band composed of discrete or clustered pink, skin-colored or tan (hypopigmented) papules that are flat-topped, smooth or scaly
- Size 2-4mm
- May be pruritic
- Follow lines of Blaschko
- May involve nail: onycholysis, splitting, fraying and total nail loss
Histology
- Padrão de dermatite de interface liquenoide
- Periadnexal inflammation: Envolve foliculo piloso e glândulas sebáceas
Tratamento
- Usually not needed
- Self limited - resolves within 1-2 years
- Topical corticosteroids under occlusion
- Topical calcineurin inhibitors
- nbUVB
Made with Bullet