Tissue: A group or layer of cells that perform specific functions. For example, muscle tissue is a group of muscle cells.issue: A group or layer of cells that perform specific functions. For example, muscle tissue is a group of muscle cells.
1 The skin is a barrier to the outside world protecting the body from infection, radiation, and extremes of temperature.  There are many types of wounds that can damage the skin including abrasions, lacerations, rupture injuries, punctures, and penetrating wounds.
Types of Lupus. There are several different types of lupus: Systemic lupus erythematosus, or SLE, is the most common form of lupus. Discoid lupus erythematosus causes a skin rash that doesn't go away. Subacute cutaneous lupus erythematosus causes skin sores on areas of the body exposed to the sun. Neonatal lupus affects newborns.