Impetigo is a general and contagious skin infection. Bacteria like Staphylococcus aureus or Streptococcus pyogenes infect the outer layers of skin, called the epidermis. The arms, face, and legs are most often affected.
Solar lentigo is a harmless patch of darkened skin. It results from exposure to ultraviolet (UV) radiation, which causes local proliferation of melanocytes and accumulation of melanin within the skin cells (keratinocytes). Solar lentigos or lentigines are very common, especially in people over the age of 40 years. Sometimes they are also known as an “old age spot” or “senile freckle”.
A halo nevus is a mole surrounded by a white ring or halo. These moles are almost always benign, meaning they aren’t cancerous. Halo nevi (the plural of nevus) are sometimes called Sutton nevi or leukoderma acquisitum centrifugum. They’re fairly common in both children and young adult