Thank you for the question.
Acne can be triggered by a number of causes. Hot and humid weather can trigger acne, as can exposure to sunlight in some individuals.[1][2] Other factors that can trigger acne include stress and hormonal factors.[3] Diets that have a high glycaemic index and high dairy intake can also aggravate acne.[4]
To minimise the development of acne, it is important to minimize the triggers where possible. In hot and humid weather, there may be a tendency for oil to build up on and clogging of the pores and it is important to cleanse the face regularly to minimize this. Avoiding the sun and using a non comedongenic sunblock may also be helpful.
I do find that the acne that occurs on the chin and around the mouth is often aggravated by hormonal factors and can vary with the menstrual cycle.
If the acne is persistent despite measures to avoid the triggers, topical and oral medications can be prescribed to help improve the control of your acne and you can see your doctor or dermatologist for further advise.
References:
1. Berg M. Epidemiological studies of the influence of sunlight on the skin. Photodermatol. 1989;6(2):80-4.
2. Sardana K, Sharma RC, Sarkar R. Seasonal variation in acne vulgaris--myth or reality. J Dermatol. 2002;29(8):484-8.
3. Jović A, Marinović B, Kostović K, Čeović R, Basta-juzbašić A, Bukvić mokos Z. The Impact of Pyschological Stress on Acne. Acta Dermatovenerol Croat. 2017;25(2):1133-141.
4. Kucharska A, Szmurło A, Sińska B. Significance of diet in treated and untreated acne vulgaris. Postepy Dermatol Alergol. 2016;33(2):81–86.
