Which symptom is an indicator of methamphetamine use?

The presence of brown sores on the body is a recognized symptom of methamphetamine use. This is often associated with the drug's impact on a user's overall health, particularly when it leads to poor hygiene and skin problems. Users may experience a condition known as "meth mouth," characterized by dental decay and sores, which can extend to skin issues due to frequent scratching or picking at the skin, a behavior that is common among users.

The other symptoms listed do not align with the effects commonly caused by methamphetamine. Increased appetite is actually more characteristic of withdrawal from meth, as the drug typically suppresses appetite when consumed. Sleepiness is contrary to the stimulant effects of methamphetamine, which often leads to increased energy and wakefulness. "Glass eyes," which may refer to a lack of focus or a shiny appearance due to dilated pupils, can be associated with meth use but is less specific than the more direct physical manifestation of brown sores. Thus, the presence of brown sores serves as a clearer indicator of the negative physical side effects of prolonged methamphetamine use.