A photoallergy is a specific immune reaction that occurs only in certain people after they have been exposed several times to the offending substance and then sunbathed or used a tanning bed. Even a small amount of the substance can cause a red, scaly or blistering eruption when the person sunbathes. The rash usuallybegins over 12 hours after exposure.
A photoallergic reaction is very individual. (more…)
Moles(nevi) are collections of nevus cells derived from the pigment- producing melanocytes. Almost everyone has at least one nevus, which can be flesh-colored, brown or bluish-black. Some are flat (Junctional), some slightly elevated (compound), and some dome-shaped (dermal). Nevi occur in about one percent of all newborn babies; the number of nevi increases in childhood. The size and pigmentation may increase throughout life, especially during puberty, pregnancy, with oral estrogens such as the Pill, and after sun exposure. Although some women such as Elizabeth Taylor are known for their distinctive “beauty marks”, many moles are unattractive or irritating, and others may change in appearance. These should be removed for microscopic examination. (more…)
Skin cancer is already a common disease but we are seeing it more and more. There may be several reasons for this but an important one is that more fair-skinned people are being exposed to sunlight, either on holiday or having emigrated to a hot country. The problem is so great in subtropical Australia that almost every adult has at least one skin cancer in their life. Much more will be said about the damaging effect of sunlight on skin but it is such an important subject that there is no harm in mentioning it twice. (more…)
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