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Irritations and Allergic Reactions. External assaults to the skin can also cause formation of dark skin patches in underarm area. For example, chemicals in underarm products such as deodorants and antiperspirants are known for causing allergic reactions and irritations of the skin. Another type of external assault to the skin is excessive rubbing.
Reasons for Flabbiness. Arm flabbiness is caused by an excess of fat, which can be the result of natural changes that occur with age. According to MedlinePlus, after the age of 30, body fat has a tendency to increase and lean muscle typically decreases.