They're mainly a cosmetic (physical appearance) issue. However, hypertrophic scars can cause pain or itching. Also, if they form over a joint, they can limit your movement so you may want to have them treated.

What does a hypertrophic scar feel like?

Like keloids, hypertrophic scars develop when too much collagen develops after a wound. Usually, they are raised, appear as a different color than the skin, and only affect the injury site. They can be itchy or painful, but these complaints tend to improve as the skin completely heals.

What does it mean when a scar is itchy?

When something injures your skin, your body's nerve endings can become damaged, too. The nerve endings can become very sensitive and cause itchy sensations as they start healing.