This example will show to how to design a real blood drop, it has made by some steps that is given in this example.
New File: Create a new file.
Pen Tool: Choose Pen tool (P key) and "AB0327" color, make some points then adjust like a blood drop by using Direct selection tool (T key) as made here.
Effects: Go to Layer Menu > Layer Style > Stroke, Bevel and Emboss and use both settings.
You will have similar.
Recommend the tutorial