The persistent itching and skin darkening on your shins may indicate dry skin eczema or lichen simplex chronicus (caused by repeated scratching or rubbing) rather than a fungal infection. It is best to avoid scratching and use a moisturiser and a mild steroid cream. Consult a doctor or dermatologist to confirm the diagnosis and receive appropriate treatment.

Your long-standing sneezing, runny nose, and breathing problems are most likely due to chronic allergies and possibly asthma. A doctor can properly assess your condition, advise regular nasal sprays and antihistamines to help control your symptoms, and suggest lung function tests to plan long-term treatment.

Your symptoms may be caused by aquagenic urticaria or a reaction to water temperature or soap. It is usually harmless and resolves quickly. Using lukewarm water, mild soap, and a moisturiser may help. If symptoms persist or worsen, please consult your doctor.