Your symptoms suggest discoid (nummular) eczema, which commonly flares up during dry winter months. The dark color is likely post-inflammatory hyperpigmentation from itching and inflammation. Since Elosalic (a strong steroid and salicylic acid combination) previously worked, you may need a similar prescription topical steroid to control the current flare. Please consult your doctor for a proper evaluation and prescription, as long-term steroid use must be monitored. For immediate care, apply a thick, fragrance-free emollient (like CeraVe or Cetaphil cream) multiple times daily, avoid hot showers, and use gentle, soap-free cleansers to help restore your skin barrier.