A scar is a mark left on the skin after a wound has healed. It is a natural part of the skin’s healing process.
Acne is a skin condition resulting in the formation of red spots and pimples, especially on the face, neck, shoulders, back, chest and upper arms. Blackheads are a mild form of acne and are not painful to touch. These are usually caused due to the clogged hair follicles filled with oil and dirt. Acne appears as little red bumps whereas blackheads have a dark surface and may not be protruded like acne.