Spotted 4 tiny red dots on my left leg. looks like sb took a red fine tip pen & drew 4 dots in a row equally spaced.seems to be dried blood. any idea?

Uncertain: Bed bug bites may have no sx's/signs except for 2 small skin puncture points. A reaction may show from an hr to several days later. It can cause itchy, pink, swollen, lesions w clear center. If hypersensite blisters may occur. A telltale sign is linear track of lesions from sequential feedings – but doesn't always occur. Bites are in areas exposed while sleeping-arms, shoulders, neck ; legs.