Skin Problems in Pigmented Skin Flashcards
What is the cause of PIH?
![](https://s3.amazonaws.com/brainscape-prod/system/cm/272/237/704/q_image_thumb.jpg?1554027500)
Increase melanin in the dermis and epidermis.
What sort of dermatoses are particularly susceptible to PIH?
Dermatoses with both dermal and epidermal changes.
- Lichen planus
- Lupus erythematosus
- Fixed drug eruption
If the pigmentation is mainly epidermal, how long can it take to resolve?
6 months
What can help PIH resolve quicker?
Bleaching agents like Hydroquinone
What is essential in PIH?
To use daily sunscreen
Dermal PIH is resistant and can last for long periods of time. What can help it?
Laser therpay
What types of scars are more prominent in coloured skin types?
Keloid scarring
If you do decide to excise a keloid scar, what can you do?
Inject it with triamcinolone
- This can help to reduce the chance of recurrence - though the chance is still high.
What is a more favourable approach to keloid scars than excision?
- Triamcinolone and cryotherapy
- Shave excision and hyfrecation.
What is this?
![](https://s3.amazonaws.com/brainscape-prod/system/cm/272/627/342/q_image_thumb.jpg?1554027898)
Acne keloidis nuchae
- Keloidal bands with scarring alopecia.
- If chronic, pustules and subcutaneous abscesses with sinuses can form.
What is this?
![](https://s3.amazonaws.com/brainscape-prod/system/cm/272/627/365/q_image_thumb.jpg?1554028038)
Pseudofolliculitis barbae
What is the treatment for pseudofoliculitis barbae?
- 6 months of anti-inflammatory antibiotic (e.g. minocycline) for 6 months.
-
Stop shaving for 3 to 6 months.
- Keep the hair 5mm long with clippers.
- Look for ingrown hairs daily and remove with sterile needles.
- Warm compress and mild steroids are useful.
-
Shaving
- Do not pull the skin
- Do not shave against the direction of growth.
Does Acne keloidis nuchae cause scarring or non-scarring alopecia?
Scarring
Where is the most common place for vitiligo to appear?
- Perioral region
- Dorsa of the hands
- Feet
- Elbows
- Ankles.
What is the pathophysiology of vitiligo?
The exact pathogenesis is uncertain.
- Can be familial.
- Positive association with HLA type DR4
- Negative association with HLA type DR3.
What is vitiligo associated with?
Vitiligo is associated with autoimmune endocrinopathies:
- Thyroid disease
- Pernicious anaemia
- Addison’s disease.