Olfleck’s phenomenon
Olfleck’s phenomenon is seen in
[A] Lichen planus
[B] Psoriasis
[C] Actinic keratosis
[D] Darier’s disease
MECHANISM of ‘Olfleck’s phenomenon’
In psoriatic nail involvement, a brownish discoloration of the nails occurs due to subungal hyperkeratoses. This is caused by a collection of parakeratotic columns in the nail bed
- Pseudo-Koebner phenomenon
- This phenomenon occurs when infectious agents, like viruses, cause monomorphic lesions to spread across previously unaffected skin.
- It can be seen in molluscum contagiosum and verrucae, which are infective warts caused by human papillomavirus
- What is Koebner phenomenon?
- An injury, wound or burn can cause new lesions that resemble the primary skin disease.
- Most often with psoriasis.
- Sometimes, it can happen to people with warts, vitiligo and lichen planus.
- Reverse Koebner phenomenon
This phenomenon occurs when existing skin lesions disappear after trauma.
