Ice Pick Scars
Ice Pick scars, being the most common, get their name from the actual formation of the scars and as the name suggests. They are shaped like the hole left from an ice pick.
The scars are deep and narrow, which makes it difficult for them to be filled up naturally with collagen and some are too deep to heal entirely. Ice pick scars are usually less than 2mm across and usually caused by inflamed comedones (blackheads) or acne vulgaris (whiteheads)
Boxcar scars are similar to Ice Pick scars, however the Boxcar scars are wide and more rectangular with vertical edges. Boxcar scars are usually found on the temples and cheeks and they can be deep or shallow, but the majority of Boxcar scars are not as deep as Ice Pick scars.
Rolling scars are the least common of the three and they are usually shallow and wide. Caused by damage under the surface of the skin, rolling scars are round and give the skin a rolling, wave-like appearance.