14yrs old brown thick fungus under toenail & dry itchy cracks between toes & peely bottom feet- 5yrs. took pills & creams dermatologist or podiatrist?

Both are qualify: There are many treatment options for the described symptoms. Either a dermatologist or podiatrists are qualified to treat skin condition of the feet.

Podiatrist: Either the podiatrist or the dermatologist can treat this condition, however, you may have a wider array of options with the podiatrist.

Both good options: Both a dermatologist or a podiarist can help with the problem.

Dermatologist: Dermatologist will be far more experienced and better informed than any other practitioner.

Toenail fungus: Podiatrists see this problem often. There are several other possible causes this could be and an examination and likely some microbiology/fungal cultures are in order based on your description. Check with you pcp or friends/family for a trusted provider - podiatry or dermatology.