What skin disease is known for causing pitting in the nails and brown spots?

Psoriasis is recognized for causing distinct changes in the nails, including pitting—small depressions or indentations—and brown spots as a result of the underlying skin condition. This inflammatory skin disease can affect the overall health of the nails, leading to alterations in texture and appearance. The pitting occurs due to the rapid turnover of skin cells associated with psoriasis, which can disrupt the normal nail growth process.

In contrast, eczema primarily affects the skin and is characterized by inflammation, redness, and itchiness, but does not typically cause nail pitting or discoloration. Athlete's foot and ringworm are both fungal infections that affect the skin, primarily on the feet or body, and do not directly cause changes in the nails like pitting or brown spots. These conditions are primarily associated with itchiness and flaking rather than the specific nail manifestations associated with psoriasis. Therefore, psoriasis is the skin disease that most closely aligns with the given characteristics of nail changes.