Sudden acne all and changes in menstrual

I've always had clear glowing skin all my life. However, whenever there's a change in my environment, my body cycles change. I lived in kochi all my life where it's humid and was always prone to rashes, itchiness, eczema and asthma. After I got married I've lived in Delhi. Though a polluted city, I've been healthy. No allergies or skin problems in delhi dry weather. After covid began I reached kochi in june. It's 6 months now. My clear skin is history now. Since june my face keeps getting acne all over. It keeps coming and vanishing every few weeks. It's more between my mid menstrual cycle to periods. And then it subsides and increases again after two weeks. Now my face is full of pimples. My periods has also been getting delayed by one week since june.. 35 days ever since I reached kochi