Freckles (Ephilides) are a common pigmentation and usually a hereditary skin blemish. They are small, defined lesions of uniform color, found most often on the face, neck, chest, and arms. They may vary in color, from red to light brown, and number, from a few to hundreds.
Sun Spots (Lentigo) or age spots, are small, dark spots associated with aging or exposure to ultra violate radiation from the sun. They are generally found on the hands and face, but any area exposed to the sun, can be affected.
Post-inflammatory hyperpigmentation usually occurs after some type of injury to the skin such as trauma, psoriasis, burns, acne, or aggressive skin care treatments. It usually goes away as the skin regenerates and heals.