Eruptions may be acute or chronic. Most of the acute eruptions belong to the exanthemata (see EXANTHEM): that is, they are bright in col-our and burst out suddenly like a ?ower. These are the eruptions of SCARLET FEVER, measles, German measles (see RUBELLA), SMALLPOX and chickenpox. In general, the severity of these diseases can be measured by the amount of eruption. Some eruptions are very transitory, like nettle-rash, appearing and vanishing again in the course of a few hours. (See also SKIN, DISEASES OF.)... eruption
Treatment: same as for NETTLE RASH. ... drug eruptions
Deciduous teeth (milk teeth) usually begin to appear at about 6 months of age. All 20 deciduous teeth have usually erupted by 3 years (see teething).
Permanent teeth (also known as secondary teeth) usually begin to appear at about 6 years of age. The first permanent molars erupt towards the back of the mouth and appear in addition to the deciduous teeth. The eruption of permanent teeth nearer the front of the mouth is preceded by reabsorption of the roots of the deciduous teeth, which become loose and detach. Eventually, permanent teeth replace all the deciduous ones. Wisdom teeth (the backmost, or 3rd, molars) usually erupt between ages 17 and 21, but, in some people, they never appear.... eruption of teeth
Ultraviolet light occurs in sunlight, but much of it is absorbed by the ozone layer. The ultraviolet light (mainly ) that reaches the earth’s surface causes the tanning effects of sunlight and the production of vitamin D in the skin. It can have harmful effects, such as skin cancer (see sunlight, adverse effects of).
Ultraviolet light is sometimes used in phototherapy.
A mercury-vapour lamp (Wood’s light) can also produce ultraviolet light.
This is used to diagnose skin conditions such as tinea because it causes the infected area to fluoresce.... ultraviolet light