Red Streaks
Red or brown streaks appearing beneath the nails are typically caused by damaged blood vessels, often resulting from nail trauma. If multiple nails are affected without any apparent cause, such as an injury, it might indicate underlying conditions like lupus, endocarditis, or psoriasis. However, individuals with darker skin tones commonly experience dark stripes across their nails, which usually do not necessitate immediate concern. Conversely, if a dark stripe is present under a single nail, particularly if it increases in size or affects the surrounding skin, it could potentially indicate skin cancer. In such cases, it is advisable to consult a doctor for proper evaluation and diagnosis.
Understanding Concave Nails
Concave nails, commonly referred to as spoon nails or koilonychia, are typically associated with iron deficiency anemia. However, they can also indicate a fungal infection, psoriasis, or lichen planus. In some cases, concave nails may be hereditary or the result of an injury. Environmental factors, such as wearing tight shoes or excessive exposure to petroleum products, can also contribute to the development of concave nails. Thumb sucking in babies and toddlers may be another causal factor. Additionally, certain medical conditions like diabetes, heart disease, hypothyroidism, and lupus are known to cause concave nails.