Hair health: Derma rollers can help with hair loss by stimulating stem cells in hair follicles. 
Blackheads: Derma rollers can help loosen blackheads.
Skin health: Derma rollers can help with:
Skincare products: Derma rollers can help skincare products penetrate deeper into the skin, which can make them more effective. 
Skin texture: Derma rollers can improve skin texture and tone, and reduce the appearance of fine lines and wrinkles. 
Skin firmness: Derma rollers can promote collagen and elastin production, which can lead to firmer skin. 
Skin discoloration: Derma rollers can help reduce acne scarring and skin discoloration.