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Lapules Are Small Eruptions: RASH, rash, an acute inflammatory skin :ruption. Rashes differ according to the charac-:eristics of the lesion: erythema is simple red-lening; maculae are separated spots of any color; lapules are small eruptions raised above the sur-ace of the skin, which may be smooth, rough, ir scaly, and round, oval, or flat; wheals (nettle ash) are swellings, usually white with red borers; vesicles are small blisters; and pustules re small blisters rilled with pus. While rashes ay cause no irritation, they are usually accom-inied by some local symptom, such as itching, ngling, burning, or pain, and at times by a gen-•alized body symptom, such as fever.
Eruptions cannot be prevented, but they can, in some cases, be predicted. This is done principally by monitoring the small earthquakes created by rising magma, measuring the swelling of the ground with tiltmeters and watching variations in the output of gas and steam vents.
Volcanic mountains differ from others in that they grow visibly during eruptions [4]. When their last growth was recent, their shape is relatively unaffected by erosion. As more eruptions take place on the same site, so the successive outflows of ash and lava increase the height of the volcano. Volcanic mountains in continental interiors are comparatively rare. They are mostly submarine or island features and can form island arcs several thousands of kilometres long; one such arc is the Aleutian Island chain.
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