Acne scar
Acne scar are caused by abnormal healing and dermal inflammation create the scar. The acne scars are estimated to affect 95% of people with acne.

Atrophic acne scars came from the lost of collagen and are the most common type of acne scar (accounting for approximately 75% of all acne scars).

Hypertrophic scars are uncommon and are characterized by increased collagen content. The hypertrophic scar is a firm and raised scar. Unlike hypertrophic scar, keloid scars can form scar tissue even beyond the original borders. Keloid scars from acne usually occur on the chest and chin.

Hypertrophic scarring can be improved with 5-10 intralesional steroid injections at monthly intervals. However, pitting scars require a much longer treatment time.

#Hypertrophic scar - Triamcinolone intralesional injection
#Ice pick scar - TCA peeling (CROSS technique)
#Rolling scar - Laser resurfacing by Erbium laser or fractional laser
  • Acne vulgaris ― 18-year-old male
  • Nodular acne on the back. Long-term inflammation can lead to thickening scars.
  • A severe case of nodular acne. The lesions on the eyebrows are full of pus. Draining the pus is recommended.
References Acne Scars: An Update on Management 36469561
Acne vulgaris is a common skin condition that can affect patients both physically and emotionally. One common complication is the development of acne scars. These scars occur when the skin's healing process is disrupted. There are two main types of acne scars: atrophic scars (ice pick, rolling, boxcar scars) and hypertrophic or keloid scars, which are less common.