There are various forms of rashes that can differ based on the cause of the rash. These can include:
Heat rash occurs when sweating is obstructed and trapped. This can be due to hot weather, or wearing clothes that does not permit sweat to flow, causing it to get trapped. Heat rash, or miliaria, appears in clusters that have tiny red bumps that often sting. It is typically not a serious concern, and applying coolness can help to alleviate symptoms.
Eczema is a common skin concern that affects many people. It is caused by a gene variation that inhibits that skin from maintaining moisture necessary for protecting the skin from outside invaders. Invaders such as bacteria can more easily infect the skin. Eczema appears in the form of random patches of red and sometimes blistery flare-ups.
This form of skin condition has a cause that is unknown. However, people who experience atopic eczema often have a family history of allergies. The appearance of this form of eczema can vary from person to person. But, typically outbreaks take form in the appearance of red skin, dry, scaly skin, blisters, and itchiness.