Hello,
Excessive dryness and itchiness on your elbows could be due to conditions like eczema, psoriasis, or simply severe xerosis (dry skin). While moisturizers like Cotaryl and coconut oil can help, the fact that it's worsening suggests the need for further evaluation to rule out underlying issues.
Next Steps
I recommend an online consultation to assess your condition in detail and provide personalized treatment. I am happy to help you with this.