BACKGROUND Ultraviolet induced light eruptions (PLE) is the commonest disease due to photosensitivity prevalent globally. Clinically, it was observed that many patients presenting with PLE were either already diagnosed with some thyroid function abnormality or later during the course developed some derangement in Thyroid Function Tests (TFT). The aim of this study is to study the association between Light eruptions and Thyroid Stimulating Hormone values. MATERIALS AND METHODS It was a prospective observational study comprising of 90 subjects. Patients presenting to Dermatological Outpatient Department (OPD) of Index Medical College, Indore, diagnosed as having Polymorphic Light Eruptions were included in the study. After taking informed consent, their TSH levels were analysed and the observations were systematically noted to see how frequently they coexisted. RESULTS Thyroid Stimulating Hormone level (TSH) was abnormal in 30% cases of patients with polymorphic light eruptions, out of which TSH was increased in 24.44% (n = 22) individuals and decreased in 5.55% (n = 5) cases. CONCLUSION Our study highlights the need to routinely assess thyroid function tests in all patients of PLE, so that an early detection of subclinical hypothyroidism be made. We suggest larger population based studies and detailed thyroid profile evaluation be performed to establish a causal association between the two if any.