Though pimples on the chin could be from any other common acne causes, they are one of the most prominent signs for hormonal adult acne. The activity of the sebaceous glands depends on the estrogen / androgen (female hormones / male hormones) ratio and a lot of other hormones. Hormone fluctuations could cause the sebaceous glands to enlarge and make more sebum (oil). Continuous breakouts can appear for some people during:
- getting on/off birth control
- Polycystic ovary syndrome (PCOS, a hormonal disorder)
- the week before or during the period (Studies have observed acne worsening in the premenstrual period in 60 to 70% of women.)
Recent studies show that sleep deprivation associated with women's modern lifestyle and stress may also be an aggravating factor for acne, affecting more than 50% of the women in studies . Stress stimulates the release of pro-inflammatory substances, leading to increased levels of cortisol (your body's main stress hormone), which further promotes acne.3. Medication
Several hormonal medications may cause or aggravate acne. Synthetic male hormones taken by athletes and body-builders to increase muscle bulk could also lead to severe acne in some cases. A variety of other medications which affect the immune system, stimulate insulin or directly affect hair follicle could also lead to acne.4. Diet
Though It is very difficult to study the role of diet and acne, there is growing evidence that what we eat may influence the incidence and severity of acne:
- Consumption of high glycemic index (a measure of the rate at which a food spikes blood sugar levels) and dairy foods increases insulin levels, which triggers a series of processes within our body contributing to acne.
- Worsening of acne by the use of dietary supplements derived from whey is observed in daily practice.
- Diets low in zinc or high in iodine can worsen pustular acne (pimples).
Studies show that tobacco is the main factor responsible for the appearance of non-inflammatory acne (comedones) for adult females. Sebaceous glands are sensitive to acetylcholine (a chemical message released by nerve cells) that is stimulated by nicotine, influencing sebum production and oxidation and increasing pore blockages.6. Environment
Environmental factors like high humidity causing swelling of the skin and pressure from chin straps causing skin irritation would also cause or aggravate acne. That's why we've seen an increase of pimples on the chin when masks became mandatory during the pandemic.