The present invention relates to an absorbent article, such as a wound pad, comprising a body (1) of compressed thermoplastic or thermo-set open-celled foam. According to the invention said body (1) has a pattern of ultrasonically 5 made depressions (2,3) in two opposite sides thereof, the depressions in the opposite sides being coaxial to each other and separated from each other by a common bottom portion (4) which is compressed to a higher extent than the remaining parts of said body. The invention also relates to a method of manufacturing such a body and to a wound dressing comprising such a body.