Here it is, separated into 5 paragraphs and kept under 300 words:

Adult acne, especially around the chin and jawline, is more common than many expect—even after 40. These breakouts are often linked to hormonal changes rather than the typical teenage causes. Fluctuations in hormones can increase oil production, leading to clogged pores and inflammation, particularly in the lower face.

Stress is another major contributor. When the body produces more cortisol, oil glands become more active, increasing the likelihood of breakouts. Even everyday stress can have a visible effect on the skin, making consistent stress management an important part of prevention.

Diet also plays a significant role. Foods high in sugar, refined carbohydrates, and dairy may trigger flare-ups by affecting blood sugar and inflammation levels. Choosing whole, balanced foods can support both skin health and overall well-being.

Skincare habits matter as well. Over-cleansing, using harsh products, or not removing makeup properly can worsen acne. Gentle cleansing, non-comedogenic moisturizers, and targeted treatments like salicylic acid or benzoyl peroxide are often more effective for mature skin.

Finally, everyday contact—like touching your face, dirty pillowcases, or phone screens—can introduce bacteria and oil to the skin. If acne persists despite lifestyle changes, it may signal an underlying condition, and consulting a healthcare professional is recommended.